HATALA, A. Bahá’u’lláh’s Seven Valleys and Developmental Psychology: Toward a Conception of Spiritual Development. The Journal of Bahá’í Studies, Ottawa, Ontario, Canada, v. 21, n. 1-4, p. 29–71, 2011. DOI: 10.31581/jbs-21.1-4.2(2011). Disponível em: https://journal.bahaistudies.ca/online/article/view/150. Acesso em: 21 sep. 2021.